(57) 1. Plate heat exchanger in the form of several heat exchanger plates (1) placed close
to and sealed against each other and having pressed-out ridges (4) to form the heating
surface of the relative plate in order to provide two different flow passages in the
same plate heat exchanger. The plate heat exchanger according to the invention consists
of identically like heat exchanger plates (1), the packing groove (9) of which has
its bottom placed in the central plane of the plate (1). The heating surface of the
relative plate is further divided into at least two area portions (5-8), the ridges
(4) in one area portion (5) having an angle (a,) relative to the symmetry axes (X
and Y, respectively) of the plate lying in its plane, which is different from the
angle (β1) formed by the ridges (4) in the other area portion (6) with the symmetry axes and
that one or more of the other plates included in the heat exchanger are turned 180°
about one of said symmetry axes (X, Y) starting from the orientation of one plate
in the plate heat exchanger.
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